'Iyo Matsumoto's 10th album, 'Private File,' was released in 1989. It is a city pop album with songs by melody makers such as KAN, REIMY, Kunio Muramatsu, Yasuharu Konishi, Senri Oe, Kenjiro Sakiya, and Yoshimasa Inoue, and arrangements by Tatsuya Nishiwaki, Hiroshi Shinkawa, and Satoshi Takebe. It includes the Japanese boogie masterpiece 'Private file wa Aketamamade...,' in which Tatsuya Nishiwaki responds with a funk sound, the dance tune 'Doyoubi no Party' by KAN, and ' Yuukyuu kyuuka ' in which Yasuharu Konishi develops a pre-Shibuya-kei sound. It also includes the single 'Sabisanara Hitotsu'. Throughout the album, the life-sized lifestyle of a single woman in her 20s during the bubble era is depicted naturally, and Iyo Matsumoto's unique singing voice, which stands up to the thick digital sound, appeals to the listener more sweetly and sadly than at the time of her debut.